chore(deps): update terraform-aws-modules/acm/aws requirement from ~> 5.0 to ~> 6.0

Updates the requirements on [terraform-aws-modules/acm/aws](https://github.com/terraform-aws-modules/terraform-aws-acm) to permit the latest version.
- [Release notes](https://github.com/terraform-aws-modules/terraform-aws-acm/releases)
- [Changelog](https://github.com/terraform-aws-modules/terraform-aws-acm/blob/master/CHANGELOG.md)
- [Commits](terraform-aws-modules/terraform-aws-acm@v5.0.0...v6.0.0)

---
updated-dependencies:
- dependency-name: terraform-aws-modules/acm/aws
  dependency-version: 6.0.0
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

api/terraform/route53.tf

@@ -53,7 +53,7 @@ resource "aws_route53_record" "api" {
 module "acm" {
   count   = var.create_custom_domain ? 1 : 0
   source  = "terraform-aws-modules/acm/aws"
-  version = "~> 5.0"
+  version = "~> 6.0"
 
   # un-comment this if you choose a region other than us-east-1
   # providers = {